This mystery is located on a large island in the west of Hordafylke, AC Valhalla.
How to Complete Torghatten Rock Cairn
To begin the mystery, interact with the stones on the cliff edge. You’ll soon find that this is an incredibly easy cairn to complete, to the point where you don’t even need to use all the stones available. You can use just two stones and stack them horizontally to reach the required height threshold. If you want to be more creative, you can always come back later and see how high you can stack the stones vertically, but it isn’t necessary to complete the mystery.
Once you’ve stacked the stones to the required height, validate their position to complete the mystery.